Showing papers on "Gear pump published in 1981"

Planocentric gear drive

Abstract: A planocentric gear drive has an eccentrically floating driving gear for simultaneously engaging a stator gear and a rotatable output gear to rotate the output gear through relatively small angular increments. The stator and output gears have different numbers of teeth and are mounted coaxially for engaging the driving gear on a common axial line of contact wherein the stator and output gear teeth are in local axial alignment at the line of contact. The driving gear is attracted into meshing engagement with the stator and output gears by a circumferentially arranged plurality of electromagnets energizable in sequence to rotate the driving gear eccentrically in steps about the stator and output gears. During this eccentric rotation, the common axial line of contact revolves in steps about the stator and output gears, with the output gear rotating through small angular increments to permit the stator and output gear teeth to remain in axial alignment at the revolving line of contact. When energization of the electromagnets ceases, the driving gear engaging the stator and output gears locks the output gear against rotation with respect to the stator gear.

Two speed final drive gear box

Abstract: A ground vehicle final drive system includes a hydraulic motor powered by an engine driven pump, and a planetary gear final drive unit mounted between the frame of the vehicle and the wheel hub. A two-speed gear box is mechanically coupled between the hydraulic motor and the final drive unit and includes a remotely operable hydraulic shifter which can shift the two-speed gear box between two gear ratios by the use of a coupling that is splined to the output shaft and slides between an annular recess in one output gear and onto a spline connection on the other output gear.

Control means for rotary power transmission

Abstract: A rotary powertransmission having a series of geartrains and two clutches alternately engageable to provide drive paths through the gear trains in series sequence has control means including a fluid pressure source and three solenoid-operated valves (A,B,C) to direct source fluid to two spool valves (51,52) which provide discrete fluid pressure signals for engagement of gear trains two at a time in progressively overlapping pairs, the gear trains being for eventual drive according to clutch engagement.

Gearbox drive for a speedometer

Abstract: A gearbox drive that adapts the drive train ratios of vehicles to standard speedometers, including an input gear, an intermediate gear and an output gear rotatable about axes defining an equilateral triangle, arranged so that upon rotation of the input shaft in either direction, the reaction forces on the intermediate gear will be substantially balanced. The gears are supported in mating cup-shaped input and output gear cases with the input gear case member having an input gear bearing and two secondary bearings each of which selectively supports either the intermediate gear or the output gear. The output gear case member has an output gear bearing and two secondary bearings each of which selectively supports either the intermediate gear or the input gear. By rotating the output gear case member 120 degrees with respect to the input gear case member during assembly and reversing the relative positions of the input and output gears, the same force balance on the intermediate gear is achieved for rotational motion of the input gear in either direction. The gearbox also accommodates reverse rotation of the output gear by eliminating the intermediate gear and directly meshing the input and output gears. The gear case members are constructed of plastic to reduce the weight and cost of the gearbox, while certain bushings along with the gears and their supporting shafts are constructed of steel to maintain the reliability, strength and integrity of the gearbox.

Method and apparatus for producing cement or plaster

Abstract: A method and apparatus for forming a cement or plaster slurry, for example, for use in mines, in which bags of cement or plaster are fed into a substantially closed chamber, are ruptured, and water is fed into the chamber at a controlled rate. The resulting mixture is fed into a macerator which serves to comminute the bag material and to mix the cement or plaster which is then fed into a pump, preferably a positive displacement pump, such as a helical gear pump and is thus pumped on to the point of use.

Hydraulic fluid-operated railway track lubricating apparatus

Abstract: OF THE DISCLOSURE A railway track lubricating apparatus which includes a multiplicity of applicators positioned next to a rail to be lubricated, a lubricant-containing supply tank, a lubricant pump having a gear drive element and a gear pump element located in the supply tank, a lubricant delivery system connected between the gear pump element and the various applicators, an actuator element in the form of a piston pump located on the side of the rail, and a hydraulic fluid recirculation system connected between the actuator element and the gear drive element, the recirculation system including a storage receptacle located inside the supply tank.

Oil pump unit

Abstract: To supply hydraulic fluid to a hydraulic apparatus, a plurality of pumps are used. One of the pumps is used as a main pump while the remaining pump or pumps are used as sub-pumps. A flow path switching mechanism selectively disconnects the sub-pumps from a supply passage to the hydraulic apparatus. In this manner, a required minimum supply of hydraulic fluid is assured with a simple arrangement while eliminating wasteful energy loss and reducing the dissipation of the horsepower. A reliable operation is maintained without any adverse influence upon the hydraulic apparatus. In one embodiment, a pair of pumps, and a control including a pair of switching valves operating as a pressure sensor and a flow controller are assembled into a pump body. The switching valves assure a reasonable supply of hydraulic fluid to the hydraulic apparatus while minimizing the dissipation of the horsepower. At this end, a pump receiving space is defined within the pump body, and a pair of valve openings are formed around the space and close to each other so that their axes extend parallel to each other. Openings and passages are cast into the pump body or formed by a simple boring operation to provide a communication between these elements. In this manner, the overall arrangement is simple and the manufacturing and assembly are facilitated, reducing the manufacturing cost. A reduction in the size and the weight of the overall unit is achieved.

Transmission with torque converter and lock up clutch with lubrication and pressurization system

Abstract: An automatic transmission includes: a gear transmission mechanism which can provide several speed stages according to selective supply of hydraulic pressures from a control system; a hydraulic fluid pump; a torque converter incorporating a lock up clutch which is selectively engaged or disengaged according to selective supply of pressure; a line fluid pressure control valve which receives a supply of pressurized hydraulic fluid from the pump and which provides a supply thereof, regulated to a line pressure level, to the control system; and a torque converter fluid pressure control valve which receives a supply of pressurized hydraulic fluid from the pump, and which provides a supply thereof to the torque converter as a source of torque converter pressure for filling it with hydraulic fluid and for selectively either engaging or disengaging the lock up clutch, this supply of torque converter pressure being regulated to a proper level by the torque converter fluid pressure control valve, when the supply of hydraulic fluid from the hydraulic fluid pump is plentiful, diverting therefrom an overflow flow of hydraulic fluid, which, when available, is supplied to the lubricating system of the gear transmission mechanism, to which the torque converter hydraulic fluid pressure is also always supplied via a throttle element.

Gear burnishing and honing machine

Abstract: A gear finishing machine is provided which utilizes a driven rotary finishing gear and two idler finishing gears. In addition a reciprocating oscillatory mechanism that employs leaf springs as the coupling member, changes rotary into reciprocating motion, which serves to oscillate the workpiece gear across the finishing gears. The machine is capable of either burnishing or honing the workpiece gear according to the ratio of the rotary to sliding velocity of the workpiece gear relative to the finishing gears, duty cycle, and loading pressures. Sensors are utilized which detect undersize and oversize gears, the withdrawing of the driven burnishing gear to the correct location to eject the workpiece gear and the presence of gears in the input and output chute which serve as control signals for the machine.

Flushable rotary gear pump

Abstract: Flushable rotary gear pumps for delivering fluidic material, such as liquid coating material, may quickly and thoroughly be flushed of material of one type in preparation for delivering material of another type. In one embodiment, a valve selectively establishes a bypass channel between an inlet to and an outlet from a pump, thereby to accommodate a relatively large volume flow of flushing media through the pump and supply and delivery lines therefor. In another embodiment, the valve is structured to monitor fluid pressure developed by the pump and to automatically control and limit the pressure to a maximum value should an overpressure condition develop. In yet other embodiments passages are provided internally of the pump for conveying flushing media to all exposed surfaces of the gears, gear shafts and pump body to flush the same of coating material, whereby the entirety of the pump may readily be cleansed. If desired, the various features may be combined in a single pump.

Engine driven pump arrangement

Abstract: An internal combustion engine includes a drive connection for auxiliary equipment The equipment includes a step-down gear and a pump impeller of a coolant pump and a pump wheel of a lubricating oil gear pump situated on a common shaft The drive connection of the engine is characterized in that pump wheels of the lubricating oil gear pump form the step-down gear for the coolant pump

Hydraulic fluid feeding device for power steering device

Abstract: A hydraulic fluid feeding device for a power steering device is proposed which has a plurality of pumps for feeding hydraulic fluid to the power steering device and a flow path change-over valve for switching the paths between the pumps and the power steering device, wherein the feeding rate of the hydraulic fluid to the power steering device is controlled by the action of the flow path change-over valve. The flow path change-over valve is operated according to the magnitude of the load exerted on the power steering device so that hydraulic fluid from all the pumps combined is fed to the power steering device when the load is great, and the hydraulic fluid from at least one of the pumps is fed to the power steering device when the load is small. With this device, the control of the feeding rate becomes efficient. It also becomes possible to bypass the hydraulic fluid from some of the pumps to a tank, independently of the delivery rates of the pumps, so that the power consumption may be reduced.

Composite clutch type multiple stage gear transmission

Abstract: PURPOSE:To prevent both reverse gear and speed change gear provided on a same input shaft from being selected simultaneously, and prevent the gears from being locked, by operating both gears in relation to each other. CONSTITUTION:When a shift lever 53 is in R shift position, a shift valve 47 closes a forward pipe path 51 and opens a reverse pipe path 52 while a reverse valve 61 is magnetized so that oil under pressure is supplied to a cylinder 44 for a reverse gear and thereby a reverse selective gear 19 engages a reverse gear 17. At this time a piston 44a in the cylinder 44 for reverse gear moves in the direction of selecting the reverse gear 17 while a piston 34a in a 1-3 shift cylinder 34 is interlocked with the piston 44a to be moved in the direction of disengaging the reverse gear 17 from a first speed gear 12 so that the reverse gear 17 and the first speed gear 12 cannot be selected simultaneously.

Load proportional antibacklash gear drive system

Abstract: A novel load proportional antibacklash gear drive system is provided wherein each portion of a split pinion gear is provided with a pressure chamber connected to a torque sensor and servo control unit for controlling the pressure applied individually to each split gear portion, against opposing tooth faces of the driven gear. The servo control unit provides high pressure (hydraulic or pneumatic) to a first split gear portion for drive in one direction while providing low pressure to the second split gear portion in the opposing rotational sense to maintain contact of the split gear with both faces of the driven gear at all times, thereby eliminating backlash. Upon reversal of the direction of rotation of the gear system, the servo unit provides high pressure to the second split gear portion which then acts as the driving gear, and maintains low pressure to the first split gear portion to maintain it in contact with the driven gear to prevent backlash upon reversal of the direction of drive of the gear system.

Low-energy extruder-pump system

Abstract: Method and apparatus are disclosed for the low energy melting, extrusion and pumping of material comprising feeding, metering, melting and mixing of such materials in an extruder having a melter screw and subsequently passing the resultant extrudate, through breaker plate and adapter means, to and through a rotary gear pump and, in turn, to a die member.

Gear machine operable as pump or motor with axially spaced and circumferentially offset pair of gears

Abstract: A gear pump or a hydraulic gear motor has two pairs of meshing external gears, in which the teeth of one of the gears of each pair of gears are circumferentially displaced with respect to the teeth on the other gear of the pair. The gears arranged on the drive shaft are connected by the latter by an internal gearing, especially by splines, whereby the number of the teeth of the internal gearing is an even multiple, especially twice, the number of the external teeth of these gears.

Gear pump for vehicle hydraulic system - has meshing gears in housing with throttle in inlet and non-return valve in outlet connection

Abstract: The gear pump or similar rotary piston pump comprises at least one driving gear (2) meshing with a driven gear (3) defining pump chambers (7) within a housing (1). Inlet (6) and outlet (8) chambers in the housing are connected to suction (5) and pressure (9) lines. The suction line contains a throttle (10). A non-return valve (11) or other pressure-operated valve in the pressure line prevents return flow into the chambers.

Drive gear for motorcars

Abstract: PURPOSE:To reduce the axial dimensions of a change gear by providing one gear transmission mechanism on the same axle with a torque converter and disposing the other gear transmission mechanism below and parallel to an output shaft of the torque converter, both mechanisms being coupled to each other. CONSTITUTION:An output shaft 14 of a fluid torque converter is provided with a first gear transmission mechanism 12 coupled thereto, which forms an underdrive mechanism for selectively accomplishing plural speed-change stages where the reduction gear ratio is 1 or more. A second gear transmission mechanism 13 forming an overdrive mechanism is mounted on a shaft 51 disposed below and parallel to the output shaft 14. Both trasmission mechanisms 12, 13 are coupled to each other through gears 53, 68, 54. A gear 69 of the described second gear transmission mechanism 13 is coupled to a differential gear mechanism 60 through a counter shaft 55.

Hydraulic circuit for a variable displacement pump

Abstract: A hydraulic circuit for a so called feathering control of a variable displacement pump in which displacement of the variable displacement pump is controlled to a minimum when every actuator in a system is not in operation thereby keeping a power loss to a minimum. The hydraulic circuit includes a jet flow sensor for detecting a dynamic pressure of fluid. The jet flow sensor is disposed in a circuit for connecting a system pressure line to a reservoir and is adapted to convert static pressure of the fluid to dynamic pressure thereof. This detected dynamic pressure is introduced into a servo mechanism for the variable displacement pump for effecting feathering control.

Bi-directional internal/external gear pump with advanced porting

Abstract: A bi-directional internal/external gear pump with advanced porting includes inlet and outlet ports symmetrical about a line perpendicular to the port centerline. An internal/external gear set is rotatable on parallel axes establishing the hydraulic centerline, which is advanced relative to the port centerline by some predetermined angle. One axis may be revolved about the other to shift the hydraulic centerline by substantially 180° minus twice the angle of advance.

Gear pump or motor

Abstract: PURPOSE:To prevent the generation of noise by forming a primary groove connected to a discharge side and a secondary groove connected to a suction side and by connecting the end to the primary groove when an ineffective engagement point between a drive gear and driven gear is located on the center line. CONSTITUTION:When an ineffective engagement point 10 between a drive gear 1 and a driven gear 2 is located on the center line, a primary groove 15 as well as a secondary groove 18 are respectively formed. The primary groove 15 connects the first figure Sa to a discharge side 4 while the secondary groove 18 connects the second figure Sb to a suction side 5. An edge portion 17 is provided in the primary groove 15, in order to connect the first figure Sa to the discharge side 4, when the primary groove 15 is disengaged from the first figure Sa. This construction maintains such a fluid pressure as not abnormally high in a part of an enclosed portion, and can gradually reduce the fluid pressure, thereby preventing the generation of noise due to fluctuation of the fluid pressure in the enclosed portion.

Lubricating oil pump drive for an internal combustion engine

Abstract: Lubricating oil pumps for internal combustion engines have hitherto had individual drive means such as a pair of skew gears. To simplify and cheapen the pump drive means, the pump is of the internal gear type and is driven by and housed within an idler gear driveably connecting the crankshaft to the camshaft. The pump body is rigidly secured to the engine and has a cylindrical periphery on which the idler gear is journalled, and the externally-toothed inner gear of the pump is driveably connected to the idler gear by a coupling sleeve.

High temperature hydraulic gear pump - has oil entraining and release galleries formed in housing adjacent two meshing gears

Abstract: The gear pump has at least one gear with a male form tooth rotating in a housing. Fluid enters a chamber, through which the circumferences of the gear passes. Fluid is captured between the teeth, passes through a gallery around the gear and into a discharge chamber. The gears and galleries are contained within the body casting.

Fluid-operated gear machine

Abstract: A gear machine, such as a gear pump or gear motor, has a housing in a chamber of which there are journalled two gears which mesh with one another. One of the gears is mounted on a drive shaft the end of which is extended outwardly from the housing. The housing is closed at one side thereof with a cover having a stepped bore for receiving the end portion of the drive shaft. The cover is formed with a circumferential projection concentric with the drive shaft and adapted for centering the cover relative to an external element to be coupled with the gear machine. The stepped bore provided in the cover forms a chamber in which a centering ring with a certain radial play is positioned, which centering ring surrounds the drive shaft. A sealing ring is also positioned in the chamber formed in the stepped bore, which sealing ring sealingly closes the housing. The centering ring provides for reliable aligning of the gear machine to the external element adapted to be coupled with the machine.

Gear pump or motor with a shaftless gear

Abstract: In a gear pump or motor having a housing and at least two intermeshing gears, one of the gears being fixed to a rotatable shaft and the other being a shaftless gear having a plurality of gear teeth rotatable on a film of fluid in close proximity to an interior surface of the housing, the improvement being a unique tooth profile on the shaftless gear. Each gear tooth on the shaftless gear has a thick top land, preferably at least twice as thick as the top land on each gear tooth on the gear fixed to the rotatable shaft. This particular intermeshing gear tooth configuration increases the bearing surface of the shaftless gear on the film of fluid within the interior of the housing to better support the shaftless gear and thereby reduce frictional wear.

Gear pump with driven pinion meshing with gear ring - has movable crescent shaped filler between them bearing in pin via rollers

Abstract: The inner toothed pump comprises a driven pinion (2) meshing with a rotating inner toothed ring (3) and a crescent-shaped movable filler element (4) between the pinion and ring. This element bears against a stop pin (6) and a pressure shoe (9), acting radially inwards on the outside of the ring. The filter element bears on the pin via one or more rollers (13), which may be retained in a roller cage (14). The contact face between the rollers and pin has preferably a very fine finish, such as a honed or polished finish.

Annular gear pump

Abstract: In gerotor pumps, in which the meshing with the ring gear has only one tooth less than the ring gear, the Hohlradzahne are normally limited by a circular arc or similar curve. Each tooth of the pinion (12) is continuously connected to a tooth of the ring gear (10) engaged. The invention improves the engagement conditions, the seal and other essential characteristics of the pump characterized in that the teeth of the ring gear have approximate trapezoidal shape with convexly curved flanks and heads. In this way, the tooth tips of pinion and ring gear to each other only in sealing but not in driving engagement. The driving engagement between the ring gear and pinion is effected solely between the relatively steep by the trapezoidal shape of the tooth flanks.

Gear pump of motor seal structure

Abstract: PURPOSE:To prevent deterioration of efficiency produced by oil leak in such a way that seal block is followed in response to deflection of gears at the time of high loading, and proper addendum clearance is maintained. CONSTITUTION:Addendum tangential face side of a seal block 31 which comparts a high pressure chamber 36 is formed as a flexible part 41, the high pressure chamber 36 is set to be able to respond to wider range than in the tooth groove high pressure range of gears 19, 20. When it comes to be under high loading, the gears 19, 20 deflect in the direction estranged also from the seal block 31, but because it leads to high pressure in the high pressure chamber 36, also the flexible part 41 expands in the directions of the gears 19, 20, the addendum clearance is decreased, and oil leak is reduced, so that the gear pump is prevented from the deterioration of efficiency.

Contaminant resistant gear pumps and motors.

Abstract: Gear pumps and motors and particularly improvements in the construction of such pumps and motors for use wherein large quantities of abrasive particulate materials are likely to contaminate the hydraulic fluid. In certain operations such as underground mining high performance gear pumps and motors are found to wear out rapidly due to contamination of the hydraulic fluid with particulate abrasives. In a gear pump and motor, side pressure plates (15) have a hardened steel back portion (30) and a front with erosion resistant rings (32) which extend beyond the root circle of the gear teeth and an erosion resistant inlay (33) in the mesh region of the teeth at the path of contact of the meshing gear teeth.

Rotary positive-displacement fluid-machines

Abstract: A gear pump comprises two pairs of internally-meshing pumping- gears 10, 12 and 14, 16 disposed one within the other. The gears may be of the gerotor-type (as shown) and the intermediate gears 12, 14 may be coupled to each other by a key 20. The innermost gear 10 may be attached to a driving shaft 18 and also to the outermost gear 16.